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B747-400 Max. Cruising Speed  
User currently offlineBOEING747400 From United States of America, joined Sep 2001, 319 posts, RR: 0
Posted (14 years 8 months 6 days 6 hours ago) and read 5186 times:

What's the maximum cruising speed for the B747-400 with the following engines:

a) GE CF6-80C2B1F
b) PW 4056
C) RR RB211-524G/H-T


2 replies: All unread, jump to last
User currently offlineHeavyJet From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 8 months 6 days 2 hours ago) and read 5137 times:

I don't know what the max speed is for the B747-400, but I'm guessing it's around .88/.90 mach.

Thrust requirements to attain and maintain that speed at altitude is less than max contiuous thrust for any of the engine types used on the 747. Also, max speed of a jet is more dependent on wing design.

User currently offlineAJ From Australia, joined Nov 1999, 2406 posts, RR: 24
Reply 2, posted (14 years 8 months 5 days 21 hours ago) and read 5115 times:

For both our RR and GE powered aircraft it is 365kcas or 0.92 mach. These speeds can be further limited by Va at lower altitudes.
I'm not sure about PW powered aircraft, but as these are airframe/control limitations I imagine it will have the same.

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